Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Cadillac CateraFACTORY OEM SERVICE PROCEDURE
Data Link Communication DTCS
DATA LINK COMMUNICATION DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| U1000 and U1255 | Class 2 Communication Malfunction |
| U1064, U1128 Or U1129 | Lost Communication with Module |
| U1300 | Class 2 Short to Ground |
| U1301 | Class 2 Short to Battery |
| U2100 | CAN-BUS Communication Malfunction |
| U2103 | Fewer Controllers On Bus Than Programmed |
| U2104 | CAN Bus Reset Counter Overrun |
| U2105 | Lost Comm with Engine Control System |
| U2106 | Lost Comm with Trans Control System |
| U2108 | Lost Comm with ABS Control System |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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